Gm performance LT4 rocker users beware

[MoeHorsePower]

I have the GM (which I heard were crane) 1.6 Rockers when I purchased the Hot Cam Kit way back in the day, They have been in the N/A motor, 525 lift, supercharged setup with 615 lift and now in my turbo motor. So far they look fine, I did replace all of the retainers and locks with each new spring setup. Maybe just lucky..

[SSlowBoat]

probably the Hot Cam spring not having enough pressure to handle the Hot Cam with stock weight LT1 valves (heavier than LT4 hollow valves).

Looks like you are good to go now though.

Lloyd

ah nice. in a few months ill be contacting you for a set of heads/cam for my 357 build.

[SSlowBoat]

I have the GM (which I heard were crane) 1.6 Rockers when I purchased the Hot Cam Kit way back in the day, They have been in the N/A motor, 525 lift, supercharged setup with 615 lift and now in my turbo motor. So far they look fine, I did replace all of the retainers and locks with each new spring setup. Maybe just lucky..

i think i said in the original post there was a recall on them for the ones they were putting on lt4 corvettes and also some of the aftermarket batch. this was back in the 90's. to be honest, i have no idea how old my rockers are. no worries now though, just wanted to show people what could happen to them.

[95albinobird]

i have a set somewhat used. i have not put on yet now i am scared

[blkchevyz]

I have the GM (which I heard were crane) 1.6 Rockers when I purchased the Hot Cam Kit way back in the day, They have been in the N/A motor, 525 lift, supercharged setup with 615 lift and now in my turbo motor. So far they look fine, I did replace all of the retainers and locks with each new spring setup. Maybe just lucky..

i had them with my 306 cam, and 600 lift cam and was chasing down a miss for ever. never did find it but i did find some marks on the rocker arms showing they were hitting the nut. later found out that they are only good till 575 or so lift.